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Re: [Xen-devel] Code 12 with VGA passthrough, even with qemu-traditional

Yep - I've now managed to get this working. The answer was simple - I assumed it would work right from bootup but it needs the Nvidia Quadro drivers installed. The built in Microsoft ones won't do, and hotplug does not work - the device must be there from the start. It looks like Nouveau doesn't work either - but I haven't rebuilt my Linux VM yet to confirm that only works with the official Nvidia drivers too.

Also, using -current it does work fine using qemu-xen. I have a VM with 5GB available running without an issue.

Thanks for the help, all. It was optimistic to hope hotplug would work, I'm just happy it works at all

On 25 August 2014 14:26, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote:
On Fri, Aug 22, 2014 at 12:25:08PM +0100, Peter Kay wrote:
> On 21 August 2014 23:42:13 BST, Richie <listmail@xxxxxxxxxxxx> wrote:
> On 8/21/2014 6:01 PM, Sander Eikelenboom wrote:
> I have a system (amd based) with radeon HD6950 that is able to be
> passed through to a linux HVM guest (although you only get output
> after the kernel loads the radeon KMS/DRM driver since it's secondary
> passthrough). This is _not_ the primary graphics card from the host
> (got another radeon for dom0).
> Just chiming in here with a side note.
> I decided to test out KVM + vfio on 3.16 with acs + intel igd patches
> and passed through my secondary card. It was successful
> ...snip...
> Now to be clear, I am partial to Xen. My thinking is that at some
> point (or perhaps even now) that using the qemu upstream device model
> with Xen will yield this type of capability.
> Hopefully the VGA passthrough will improve on Xen (non VGA passthrough is fine). I'm curious too as to whether Xen could use VFIO at some point - there's been a lot of work to decouple it from KVM and remove assumptions about PC architecture (like Xen, KVM is busily supporting ARM).
> Would it be possible or do licensing/coding issues apply?

No license issues. The issues that exists are just bugs.
There are some issues in QEMU that make passthrough with
radeon and intel cards a bit iffy.
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